An Action that forwards to the context-relative URI specified by the parameter property of our associated ActionMapping. This can be used to integrate Struts with other business logic components that are implemented as servlets (or JSP pages), but still take advantage of the Struts controller servlet's functionality (such as processing of form beans).
Well, they are confusing, but to make it simple, remember:
1. ActionForward: One which is a return type of Action#execute() method and used by RequestDispatcher.
2. ForwardAction: Dummy (not exactly) action which can be used to delegate to the servlet or any other business logic implementer which can utilize the Struts other functionality, like ActionForm.